Matte (Dull) FinishA finish with low gloss. With respect to coated box paper, a finish with a gloss test less than 55%.

Matte Film A graphic arts film containing a fine particulate coating to facilitate achievement of a uniform vacuum during the imaging of analog photopolymer flexo plates.

Micrometer An instrument for measurement in terms of minute dimensions.

Moiré An interference pattern caused by the out of register overlap of two or more regular patterns such as dots or lines. In flexographic printing, it can be caused by incorrect relative screen of the anilox rolls and halftone plate. Screen angles are selected to minimize this pattern.

Monomer A chemical combination of molecules corresponding to the individual units of a polymer. It is capable of being incorporated (polymerized) into polymers.

Mottle A speckled, indistinctly spotted, or uneven appearance of printing (as in an ink lay), mostly in solid areas. Attributable to various causes.

Mounting The process of affixing plates on a cylinder or base in proper position to register color to color as well as to the wrapper or bag to be printed.

MSDS Material safety data sheet. In the United States, OSHA has established guidelines for the descriptive data that should be concisely provided on a data sheet to serve as the basis for written hazard-communication programs. The thrust of the law is to have those who make, distribute, and use hazardous materials be responsible for effective communication.

Mylar® A clear, tough polymeric polyester. Produced in the form of a clear film.